Why optimized version is slower than unoptimized?

Hi,
I have very strange behavior.
I have really simple api with actix_web that return value from hashmap.
I made stress test with Jmeter on "unoptimized" version(cargo run) and it run very fast on multithreads.
But, after compiling(cargo build --release)
It run very slow compare to the "unoptimized" version.
here is the code:

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